Assessment of Ground and Surface Water Quality for Irrigation at Dumki, Patuakhali in Bangladesh

Abstract

Water is one of the most valuable natural resource on earth but its quality is very much important and its quality as well as its utilization for irrigation. The present observation was carried out to find out the quality of 50 ground and surface water samples collected from 5 unions at Dumki upazila under Patuakhali district. The chemical analysis of water samples including pH, EC, K+, Na+, PO43- and SO42-. The pH of ground and surface water were 7.22 to 8.47 and 6.56 to 8.51. The EC of ground and surface water were 620 to 4400 and 160 to 590 µScm-1. The EC of ground water was higher than the surface water. The PO43- concentration of ground and surface water were 0.12 to 0.80 and 0.0531 to 0.4248 mgL-1. The SO42- concentration of ground and surface water were 3.33 to 18.76 mgL-1 and 5.504 to 17.364 mgL-1. The concentration of PO43- and SO42- in all collected water samples were within the safe limit for irrigation and the concentration of Na+ of ground and surface water were 40.35 to 83.63 mgL-1 and 13.54 to 26.73 mgL-1. The Na+ concentration was higher in ground water than the surface water. K+ concentration of the ground and surface water were 4.11 to 29.79 mgL-1 and 11.64 to 89.73 mgL-1 respectively. The K+ concentrations of ground and surface water were not the safe limit for the irrigation. The SO42- concentration in this area was estimated within the safe limit for drinking.